Heat exchange device



c E. SAFFORDY 1,825,209

HEAT EXCHANGE DEVIGE Sept. 29, 1931.,

2 Sheets-Sheet 2 Original Filed Oct. 6, 192'? Patented Sept. 29, 1931 UNITED S ATES- summon n. sen-om), or cmvnnm, omc

HEAT nxcmnea nnvrcn Application filed October 6,1927, Serial in. mm. Renewed Magnet :5, 1m.

This invention relates to heat exchange dewoes and more particularly to ap aratus for heating or cooling buildings, enc osures and the like through indirect action by the circulation of fluids through said devices.

One of the objects of the invention, is the provision of new and improved heat exchange deV-ice'that will have the maximum heat radiating or absorbing space occupied by the device.

A further object of the invention is the provision of a new and improved device that is not injured by freezing, has no pockets for collecting and retarding the flow of the circulating'fluid, and wherein the circulating fluid, when the device is installed, may flow freely through the device, thus effecting a rapid interchange of heat and'avoiding rusting or corrosion of the material of which the go device is composed.

Other objects of the invention are the provision of a new and improved heat exchange device formed from sheet metal that is cheap to manufacture, easily assembled, rugged in construction, of light weight, that may be readily installed with a minimum amount of labor and expense, that may be assembled without stretching or otherwise injuriously distorting the metal, and that when installed will permit a rapid'interchange of heat.

Other and further objects and advantagesof the invention will appear from the following description taken in connection with the accompanying drawings in which Fig. 1 is a side elevation of the device; Fig. 2 is an end elevation thereof; Fig. 3 is a plan view, with parts in section and parts broken away; Fig. 4 is a vertical section on the line 4-4 of Fig. '1, with parts broken away;

Fig. 5 is a section on line 5-5 of Fig. 1, with parts broken away;

Fig. 6 is a perspectlve .view of a portion of the upper end and one side of the device; Fig. 7 is a perspective view of a portion of one of the halves of the device;

Fig. 8 is a plan view of a ortion of one of the blanks, showing the notch therein; and

Fi 9 is a vertical section, similar'to Fig. 4, but s owing a modified form of construction.

surface for the In the form of the device selected to illustrate one embodiment of the invention, and which is by way of example only, the device comprises the two halves or sides 10 and 11 formed from strips of sheet metal.

In the manufacture of sheet metal heat exchange devices, such as radiators, it has been the practice heretofore to stretch the metal at the ends in order to brin the adjacent edges together to form the fo ds or sections of the evice. In the construction of the resent device, the stretching of the material 7 1s avoided by cutting substantially V-shaped notches 12, see Fig.8, in the ogposite side edges of the strip and then ben m or cor-' rugating the sheet to form the fol s or corrugations 15' and the return curved portions 16 between the folds, after which the upper and lower ends of the return curved portions 16 are each ressed outwardly orflattened as at 17 see i 7 to form a straight continuous surface. he slots 12 extend the full depth of the corrugation and its edges 13 and 14 areconvexso that when the dance iscomplete there will be no pockets for retaining water that would cause rusting of the material.

The dimensions and form of the slot 12 are such that when the ends of the return curved portion 16 of the corrugated sheet are pressed outwardly. or flattened as at 17 to form a continuous flange as shown in Fig. 7, the edges 13 and .14 engage each other and are then secured together as by welding, thus forming whatforconvenience will be termed 5 one hal of the radiator; The two halves are preferably duplicates, the other half being made in the same manner.

The two halves are connected to ether at theirjupper and lower ends bytroug -shaped strips 18 and 20 respectively. Each of these strips is provided with straight flanges 19 which may be rabbeted as at 21 for receivin the flanges 17, see Fig. 4. The flan es 1 and 19 are securedtogether, as by wel 1n The ends of the two halves are secure together in any suitable manner. The ends of the strips may be extended and connected directly together as by welding, but preferably, connecting strips 22 and 23 are employed for offset 33 in which the free end 34 of the Z-- water into the folds of the radiator.

this trou of heavier material for giving rigidit to the structure, and for constituting con uits for draining the water where steam is empliyed as the heating fluid.

ach ofthe connecting strips 22 and 23 is provided with inwardly extending flanges 24 to which the edges of the sheet metal forming the two halves of the device is secured as by welding. By means of this arrangement the device may be installed with either end or side turned upward. If mounted on end, the strips 22 and 23 will form conduits for the water of condensation.

The strips 18, 20, 22 and 23 are preferably of heavier material than the corru ated sheet metal sides and may be stamps or otherwise formed. The ends of the strips 18, 20, 22 and 23 are formed into a circular projection 25 on which is rigidly connected the coupling 26 as by weldin The couplings 26 are internally threads for receiving the pipe connection in the usual manner.

11 order to increase the radiating or absorbing surface of the heat exchange device, the sides 27 and 28 of the corrugations 15 are parallel and the return curve 16 is on a comparatively large radius. This arran ement will not onl add to the radiating sur ace of the device, ut will also permit a slight expansion of the same, should water freeze therein.

Suitable means are provided for preventing colla se or unnecessary lateral and longitudina expansion of the sheet metal corrugated structure.- As shown, interlockin members are employed for thispurpose. bers comprise Z-bars 29 and 31 which are welded or otherwise secured to the returncurve 16 on the inner sides thereof. The bar plurpose. These strips, as well as the g -S 29 has its upper flange 32 secured to each of the return-bends 16 and is provided with an bar 31 is adapted to engage. The bar 31 in turn is provided with an offset portion 35 for receiving the free edge 360 of the bar 29.

In assembling the parts, the bars are first attached to the two ha ves of the radiator, the halves are then assembled, after which the stri s 18, 20, 22 and 23 are applied.

vi ah the device in the position shown in Fig. 4 it will be observed that the bars 29 and 31 are so interlocked that they do not form pockets for collecting water. The bar 29 overlaps the bar 31 thereby directing ltge e ends of the bars extend through the strips 22 and 23 and are firmly secured therein m any suitable manner as by being welded. Any suitable number of these reinforcing bars may be used. In the form shown, two

airs are employed between the upper and ower portions of the radiator.

the construction of large radiators,

aped strips 18 and 20, may be made 886 memwherein the corrugations or folds are deep, it is desirable to provide reinforcing means between the corru ations. These reinforcing members may eadh com rise a channel bar 36 having the flan es 3 and 38 turned inwardly and secure to the ad'acent sides of the corrugations in any suita le m'anner as by weldin These channel bars may extend substantiall the entire length of the corrugations. In heat exchange devices, such as the conventional radiators, these reinforcing members are not necessary, and may be omitted.

In Fig.9 is shown a modified form of construction in which one of the side members is omitted. This construction differs from that shown in Fig. 4 in that a sheet metal plate 100 is substituted for the side member 10. The construction is otherwise substantially the same. This arran ement is convenient for wall radiators an the like making it possible to readily attach the devices to the walls of buildings and the like.

The sides 27 and 28 of the folds or corrugations 10 of the side members may be spaced at any desired distance apart. The radiating surface for any given ca acit of radiator will obviously be increase by ecreasin the distance between the sides or folds o corrugations, and the distance between the;

minimum amount of space with a maximum;-

surface. The device being made principa y from sheet metal, the fa rication is largely a stam in and welding operation, an conse uent y t e same can be manufactured at a necessary to produce the cast radiators that are 1n common use.

It is thought from the foregoing taken in connection with the accompanying drawings that the construction and operation of my device will be apparent to those skilled in the art, and that various changes in size, shape, pgoportion and details of construction may made without departing from the spirit and scope of the appended claims.

I claim as my invention:

1. In a heat exchange apparatus, the combination of a air of sides folded, bent and welded to pr uce corrugations having substantially arallel sides and havin closed ends, said sldes terminating at the ends of the corrugations in spaced flanges, each flange constituting a continuous weldin band extending throughout the length 0 the radiamount of radiatin ator, trough-shaped strips bridging the raction of the cost" the 2. In a heat exchange apparatus, the combination of a pair of sheet metal sides bent into a succession of folds connected together by curved ortions, means for connecting the ends of sald sides together ermanently, and with the edges of the metal etween the folds bent to constitute continuous flan es, the flanges at adjacent ends of the two s eetsbeing spaced apart, and trough-shaped strips attached to and bridging the s aces between said flanges, said trough-shape strips openedges of the sheets together and coupling.

members attached to the structure at the ends of said strips, the metal of said means and strips being formed to constitute flanges to which are attached said coupling members.

4. In a heat exchange apparatus, the combination of a air of sides folded, bent and welded to pro uce parallel corrugations having closed ends, the ends of the inner portions of the corrugations being flattened and curved outwardl until they constitute parallel flanges, troug -shaped strips bridgin the spaces between the flanges and attached t ereto and means connecting across between said inner portions of the corrugations between the ends thereof, to stiffen the structure.

5. In a heat exchange apparatus, the combination of a pair of sides folded, bent and welded to produce parallel corrugations being substantially semi-cylindrical between their ends, the ends of said inner portions of the corrugations being bent outwardly until they constitute parallel flanges at the closed ends of said corrugations, the length of the end edges of the sides remaining the same, and trough-shaped strips united to and bridging the spaces between the flanges.

6. In a heat exchange apparatus, the combination of a pair of sides folded, bent and welded to produce parallel corrugations being substantially semi-cylindrical between their ends, the ends of said inner portions of the corrugations being bent outwardly until they constitute parallel flanges at the closed ends of said corrugations, the length of the end edges of the sides remaining the same, and trough-shaped strips opening toward each other and united to and bridging the spaces between the flanges, the side edges of the sheets being united and bent to form troughs which extend between the ends of said trough-shaped strips, and coupling memhere united to said sides at the meeting points of said troughs.

7 In a heat exchange apparatus, the combination of a air of sides folded, bent and welded to pro uce corrugations connected together by curved portions and having closed ends, trough-shaped members opening toward each other and ridging the se arated portions of said corrugations, an cylindrical coupling members connected with the metal constituting said sides at the ends of said strips.

8. In a heat exchange apparatus, the combination of a pair of sheet metal sides formed to produce corrugations having closed ends, trough shaped members bridgmg separated portlons of said corru ations trough-shaped members connecting the side edges of said sheet metal sides, coupling members connected to the ends of said trough shaped members and means connecting across between the sheet metal sides intermediate the ends thereof and connecting to the adjacent bottoms of the corrugations and comprlsing bars having inter-engaging portions.

9. In a heat exchange apparatus, the com-v bination of a pair of sheet metal sides bent into a succession of folds and with the ends of the latter brought and permanently fastened together, members bridging the spaces between the folds and members for connecting the lateral edges of the sheets together,

said members being attached to each other and formed to constitute the inlet and outlet openin adjacent to the ends of said strips.

10. n a heat exchange device a pair of side members, each comprising a sheet of corrugated sheet metal, the sides of each corrugation being substantially parallel and connected to the adjacent corrugation by a return curved portion, and means including rigid trough-shaped members opening towards each other for connecting the ends and edges of the side members.

11. In a heat exchange device, a pair of corrugated sheet metal side members, said corrugations being curved at their outer portions and having their connecting portlons 'curved, rigid trough-shaped members for connecting the upper and lower portions of said side members, and rigid trou h-shaped members for connecting the ends 0 said side members to ether.

12. In a Ileat exchange device, a pair of complementary corrugated sheet metal side members, said corrugations being curved at their outer portions and having their connecting ortions curved, 'means for connecting t e'ends and-sides of said members together, and reinforcing members secured to the connecting portions of said corrugations and to the connecting means at the ends of said device, said reinforcing members being interlocked.

13. In a heat exchange device, a pair of corru ted sheet metal sidemembers,said corrugations being curved at their outer portions and having their connecting portions curved, rigid trough-shaped members for connecting the upper and lower portions of said side members, and a vertically extending reinforcing bar between said corrugations on the exterior thereof.

14. In a heat exchange device, a pair of corrugated sheet metal sides, the sides of said corrugations being parallel and connected together with curved portions, trough-shaped members openin toward each other connecting the sides an ends of said members, said members connected together at their ends and being extended laterally to form tubular projections, and coupler members rigidly secured on said projections.

15. In a heat exchange apparatus, the comhination of a pair of sheet metal sides bent into a succession of folds and with the sides of each fold permanently connected together at the ends of the fold, the connecting portions of said folds being curved, and members for permanentl connecting the edges of said sheet metal si es together.

In testimony whereof I herewith alfix my signature.

CLARENCE E. SAFFORD. 

